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/*
Copyright (C) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
Laboratory CNBI (Chair in Non-Invasive Brain-Machine Interface)
Nicolas Bourdaud <nicolas.bourdaud@epfl.ch>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//#include <sys/time.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <eegdev.h>
#define DURATION 1 // in seconds
#define NSAMPLE 4
#define NEEG 7
#define NEXG 0
#define NTRI 0
#define scaled_t float
char devpath[256] = "/dev/rfcomm0";
int verbose = 0;
struct grpconf grp[1] = {
{
.index = 0,
.iarray = 0,
.arr_offset = 0,
.nch = NEEG,
.datatype = EGD_FLOAT
},
};
static
int print_cap(struct eegdev* dev)
{
unsigned int sampling_freq, eeg_nmax, sensor_nmax, trigger_nmax;
char *device_type, *device_id;
int retval;
egd_get_cap(dev, EGD_CAP_DEVTYPE, &device_type);
egd_get_cap(dev, EGD_CAP_DEVTYPE, &device_id);
egd_get_cap(dev, EGD_CAP_FS, &sampling_freq);
eeg_nmax = egd_get_numch(dev, egd_sensor_type("eeg"));
sensor_nmax = egd_get_numch(dev, egd_sensor_type("undefined"));
trigger_nmax = egd_get_numch(dev, egd_sensor_type("trigger"));
retval = (int)sampling_freq;
if (!verbose)
return retval;
printf("\tVersion : %s\n"
"\tsystem capabilities:\n"
"\t\tdevice type: %s\n"
"\t\tdevice model: %s\n"
"\t\tsampling frequency: %u Hz\n"
"\t\tnum EEG channels: %u\n"
"\t\tnum sensor channels: %u\n"
"\t\tnum trigger channels: %u\n",
egd_get_string(),
device_type, device_type,
sampling_freq, eeg_nmax, sensor_nmax, trigger_nmax);
return retval;
}
int read_eegsignal(void)
{
struct eegdev* dev;
size_t strides[1] = {NEEG*sizeof(scaled_t)};
scaled_t *eeg_t;
int i, retcode = 1;
int fs;
char devstring[256];
eeg_t = calloc(NSAMPLE*NEEG,sizeof(*eeg_t));
sprintf(devstring, "neurosky|path|%s", devpath);
if ( !(dev = egd_open(devstring)) )
goto exit;
fs = print_cap(dev);
grp[0].sensortype = egd_sensor_type("eeg");
if (egd_acq_setup(dev, 1, strides, 1, grp))
goto exit;
if (egd_start(dev))
goto exit;
i = 0;
while (i < fs*DURATION) {
if (egd_get_data(dev, NSAMPLE, eeg_t) < 0) {
fprintf(stderr, "\tAcq failed at sample %i\n",i);
goto exit;
}
i += NSAMPLE;
}
if (egd_stop(dev))
goto exit;
if (egd_close(dev))
goto exit;
dev = NULL;
if (retcode == 1)
retcode = 0;
exit:
if (retcode == 1)
fprintf(stderr, "\terror caught (%i) %s\n",errno,strerror(errno));
egd_close(dev);
free(eeg_t);
return retcode;
}
int main(int argc, char *argv[])
{
int opt, retcode = 0;
while ((opt = getopt(argc, argv, "p:v:")) != -1) {
switch (opt) {
case 'p':
strcpy(devpath, optarg);
break;
case 'v':
verbose = atoi(optarg);
break;
default: /* '?' */
fprintf(stderr, "Usage: %s [-p path] [-v verbosity]\n", argv[0]);
exit(EXIT_FAILURE);
}
}
// Test generation of a file
retcode = read_eegsignal();
return retcode;
}
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